ROCKLAND, Maine — A former loan officer who stole more than half a million dollars from Camden National Bank clients has been sentenced to 33 months in prison.

Christina Torres-York, 40, of Warren pleaded guilty in January and was sentenced in federal court in Portland on Tuesday by Judge D. Brock Hornby. In addition to prison time, she also must pay back $625,000 that she stole.

Court documents said that Torres-York worked at the Waldoboro branch of Camden National Bank and had access to customers’ lines of credit. The company said Torres-York made $749,402 in unauthorized withdrawals from five customers’ lines of credit in the span of at least two years — from 2007 to October 2009.

When customers complained about the withdrawals, Torres-York would tell them that “the unauthorized withdrawal was a mistake that would be remedied by the bank,” the documents state.

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Torres-York transferred the money she took from the customers’ lines of credit to at least eight people, including herself, according to documents.

Torres-York was fired from the bank in October 2009, immediately after the bank discovered the thefts, according to the affidavit of Danny Swindler, the company’s vice president.

Days after she was fired, an employee found a letter of confession that Torres-York wrote in a night depository box, according to Swindler’s affidavit. That letter was redacted from the court documents.

“In the letter, Defendant Torres-York confessed that she ‘used several lines of credit’ and that she was ‘terribly sorry for the embarrassment [she] caused for Camden National Bank and [her] family,’” Swindler wrote in his affidavit.

According to Swindler, the letter said, “Please take this from my 401(k) so that everything is even,” and, “I’m so sorry it became a mess. I will not be in at 8, as I can not hold up my head any longer, ashamed at what has happened and what I have done to so many people that trusted me.”

Torres-York will pay $595,308 to Camden National and $29,705 to Maine Contractors and Builders Alliance Inc., a nonprofit organization for which she volunteered and from which she also stole money.